All files / src crypt.js

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const crypto = require('crypto')
 
/* Encrypts a 32-byte buffer using AES-256-ECB with the given 32-byte key */
// Internal use only
function encrypt (data, key) {
  if (!Buffer.isBuffer(data)) throw new TypeError('data must be a buffer')
  if (data.length !== 32) throw new RangeError('data must be 32 bytes')
  if (!Buffer.isBuffer(key)) throw new TypeError('key must be a buffer')
  if (key.length !== 32) throw new RangeError('key must be 32 bytes')
 
  const cipher = crypto.createCipheriv('AES-256-ECB', key, null)
  cipher.setAutoPadding(false)
  return Buffer.concat([cipher.update(data), cipher.final()])
}
 
/* Decrypts a 32-byte buffer using AES-256-ECB with the given 32-byte key */
// Internal use only
function decrypt (data, key) {
  if (!Buffer.isBuffer(data)) throw new TypeError('data must be a buffer')
  if (data.length !== 32) throw new RangeError('data must be 32 bytes')
  if (!Buffer.isBuffer(key)) throw new TypeError('key must be a buffer')
  if (key.length !== 32) throw new RangeError('key must be 32 bytes')
 
  const decipher = crypto.createDecipheriv('AES-256-ECB', key, null)
  decipher.setAutoPadding(false)
  return Buffer.concat([decipher.update(data), decipher.final()])
}
 
module.exports = { encrypt, decrypt }